Here is transcriptions and original works published by Klarthe.
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Sheet music
Sinfonia Concertante K297B (1778) - W.-A. Mozart
For oboe, clarinet, french horn, bassoon and wind orchestra
Trio Lirico, op. 143 - Nicolas Bacri
For clarinet (or violin), viola (or cello or french horn) and piano
Nadir - Matthieu Stefanelli
Opéra-Conte pour choeur d'enfants à 3 voix égales, 5 récitants et orchestre d'harmonie